infant

n. 1 a child during the earliest period of its life. B schoolchild below the age of seven years. 2 (esp. Attrib.) Thing in an early stage of its development. 3 law person under 18.  infancy n. [latin infans unable to speak]

n. A child in the first period of life, beginning at his birth; a young babe; sometimes, a child several years of age.